code: def test_rcnn_export_target_generator():
      model_name = "faster_rcnn_fpn_resnet50_v1b_coco"
      gcv.utils.export_block(
          model_name,
          gcv.model_zoo.get_model(model_name, pretrained=True),
      )
  
file_path: gluon-cv/tests/model_zoo/test_utils_export.py
imports: from __future__ import print_function
  import numpy
  import mxnet
  import gluoncv
  from gluoncv.model_zoo.model_store import pretrained_model_list
  from ..unittests.common import try_gpu
label_desc: Use image node_id 3 for calling a global function with example usage: test_rcnn_export_target_generator() without return types